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= 5x + 2+ 4x -3 +x
= 10x -1
jawabn soal b
a.) kliling = 2 ( 4a - 3+ 2a +1)
= 2 ( 6a -2)
= 12a - 4
b.) kliling = 12a - 4
32 = 12a-4
32 +4 = 12a
36 = 12a
36/12 = a
3 = a
panjang = 4a - 3
= 4(3) - 3
= 12-3
= 9
lebar = 2a + 1
= 2(3) + 1
= 6 + 1
= 7